James Bowes - Post 16 Computer Science

WAN vs LAN Wide Area Network (WAN) operate over large geographical area. Connects multiple networks together. Relies on third party carriers or connections such as that provided by BT. Local Area Network (LAN) operates over a small geographical area (one office site or home) and connects devices together via Wifi or network cables. These include PCs, scanners & printers etc. Topologies Physical topology – a network is its actual design layout which is important when you select a wiring system. Logical topology – shape of the path the data travels in, and describes how components communicate across the physical topology. Ethernet – uses a logical bus topology when components communicate, regardless of the physical layout. Bus Topology LAN can use different topologies. In a bus topology, all computers are connected to a single cable. The ends are plugged into a terminator. Advantages - Inexpensive to install as it required le...

Physical Structure Each continent has its own backbone of cables which connect to trans-continental cables which connect the internet together across the world. So everybody can access all of the same data. National ISPs then connect to the backbone and distribute the internet to smaller providers which then distribute it to the people and homes. Uniform Resource Locators (URL) Full address of internet resources. Specifies the location of a resource on the internet, including the resource name, so that the browser can request it from the website server Internet Registrars Internet registrars hold databases of all the domain names that are currently available to purchase. These companies then act as resellers for the 5 main registries around the world. Companies and individuals can purchase them for use. The registries allocate IP addresses and keep track of which domain names is associated with as part of the Domain Name System (DNS). ...

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